Exhibition screen



J. F. imi EEEEEE R IIIIIIIIIIIIII EN TTTTTT EY Patented Aug. 24, 1926.

UNITED STATES PATENT OFFICE.

JOHN F. TROEGEB, F NEW YORK, N. Y.

EXHIBITION SCREEN.

Appneation med May a,

be produced by intercepting the rays of'r light which form the pictureby the use of lo a very thin semi-opa ue film. I have also discoveredthat this m can be most ractically and effectivel vproduced by eitherlaying it on or embe dingit in the body Aof a screen made' of atransparent or nearly transparent material. I have also discovered thata surface having very prefectly formed corrugations of sinusoidal crosssection e1;-v ltending vertically prevent distortion when the picture isviewed obliquely and from experiments have learned that 26 corrugationsor more per lineal inch of screen gives the best results.

My invention therefore is directed tothe embodiment of means forproducing a screen of this character. For this purpose I use, as onemeans, a sheet of transparent material or transplarent to a degreenecessary to procure t e results hereinafter set forth, and havintheside exposed to the audience, herona ter referred to as the displayside coated with a yry thin translu- 'cent film or a film more opaquethen the material of which the body of the screen is formed in orderthat the picture may be produced on the lm and not on the body` of thescreen, and'whereby ve little of the projected light will be absor orlost in the body portion of the screen but will be effective inproducing a picture on the 40 film of maximum brightness and definition.I first provide the body portion` of the screen with the corrugationstherein and afterward coat the corrugations with a translucent materialsuch as a veryA thin varnish that will not fill the corrugations butsimply coat their surfaces, or if the screen is made without the corruations, the varnish may be applied in a. eavier coat.

A transparent coating of very thin elastic varnish -may then be ap liedto protect the vtranslucent film from alrasion in handling or cleaning.

Referring to the drawings, Fig. 1 is a view illustrating the displayside of the screen;

1921. Serial No. 466,045.

Fi 2 is a view showing a cross section ang form of the corrugations onan enlarged sc e;

Fig`. 3 is a cross section illustrating the body of the screen and thetranslucent eoatin'g or embodied film and protective coating referredto;

Fig. 4, illustrates a screen Without the corru ations. l

indicates the bodyy portion of the screen.

B indicates the form of the corrugations. C indicates the translucentfilm. D indicates the protective transparent coating.

The body of the screen may be made of glass, or any suitable transparentmaterial but I prefer to make it of a. compoun that it is tou h andfiexible and which is fully describe in the United States patent grantedto me on Au ist 24, 1915, No. 1,151,502, which describe a composition ofgelatin and glycerine suitable for the urx pose, as it can be made. in athin strong s eet 80 that can kbe bent to form a roll without in- )u Theabove description is considered ample for those skilled in this art andtherefore further description is deemed unnecessary, in view of thefurther specifications set forth in the claims.

Having thus described my invention, I claim as new 1. A screen fordisplaying pictures through. a transparent body portion having a film onits display side of less transparency than that of the body ortion andrelatively of less thickness and sinusoidal corrugations formed in itsdisplay side.

2. A. screen for displaying pictures comprising a transparent bodyportion formed with a smooth uniformly corrugated surface on one sidethereof and a fihn coating following the surface of said corrugations toform a surface on which to display a picture.

3. A screen for displaying pictures comprising a transparent bodyportion formed with corrugated surface on one side thereof and a film`coating. following the vsurface of said corrugations to form a surfaceon which to display a picture, and a. coating of transparent materialcovering said film and following the contour of said corrugations.

4. A screen for displaying pictures comprising a transparent bodyportion formed tra with a corrugated surface of sinusoidal form on oneside thereoi2 and a lm coating following the surface or" saideorrugations to form a surface on which to display' a picture.

A screen for displaying pictures comprising a transparent body portion'formed with a corrugated surface of sinusoidal form on one thereolt anda filni coating following the surface of said corrugations to form asurface on which to display a picture and a coating of transparentmaterialcovering said tilms and following the contour of saidcorrugations.

i screen for displaying pictures comprising a substantially transparentbody portion o'l tierible material having one side formed iat and theopposed side formed with a plurality et sinusoidal corrugationsextending vertically thereof and havingl upwards of twenty-si per linealinch of width and coating off less transparency and practically eventhickness covering said corrugations.

7. A screen for displaying pictures comprising a substantiallytransparent body portion of exible material having one side formed flatand the opposed side formed with a plurality of sinusoidal corrugationsextending vertically thereof and having upwards of twenty-six per linealinch of width and a coating of less transparency and practically eventhickness covering said corrugations, and a transparent coating of eventhickness covering said last named coating.

8. A screen for displaying pictures comprising a substantiallytransparent body portion having one side formed Hat and the opposed sideformed with a plurality of sinusoidal corrugations extending verticallythereof and having upwards of twenty-six per lineal inch of width and acoating of less transparencyT and practically even thickness coveringsaid corrugations.

9. A. screen for displaying pictures comprising a substantiallytransparent body portion having one side formed ilat and the oppositeside formed with a plurality of sinusoidal corrugations extendingvertically thereof and having upwards of twentysix per lineal inch ofwidth and a translucent coating of less transparency and practicallyeven thickness covering'said corrugations.

10. A -screen for displaying pictures comprising abody portion oftransparent material, one side of said screen being formed with asmooth, uniformly corrugated surface, and a relatively thin translucentfilm located adjacent said side, and disposed beneath said surface.

1,1. A screen for displaying pictures com prising a body portion oftransparent material, one side of' said screen being formed with asmooth, uniformly corrugated surface, and a relatively thin translucentfilm located adjacent said side, said 'film being disposed beneath saidsurface, and arranged to follow the contour of said corrugations.

l2. A screen displaying pictures comprising a body portion oftransparent material, having one side formed with sinusoidalcorrugations, said body portion having a translucent materialcomparatively thin in crosssection incorporated therewith to follow thesinusoidal contour of said corrugations.

13. A screen for displaying pictures comprising a body portion oftransparent material, said body portion having a plane face on the sidefacing the projector and a corrugated face ou the side facing theaudience, said corrugations being sinusoidal and extending vertically, asemi-opaque film of even thickness covering said corrugations and aprotective transparent coating coverinfr the film.

igned at New York city, in the count of Kings and State of New York,this 26t day of April, 1921.

JOHN F. R. TROEGER.

